Thomas m



T. M. BRADLEY.

Y f Sewing Machine.

No' 748492' Patented Feb. 18, 1888.

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Letters .Patent No.-74,492, dated February 18, 1868.,`

.IMPROVBMEN T IN SEWING-MACHINES ttige tlgttnls natur tu in tigre Eaten Atttut mit mutageni nf tte time i TO ALL, WHOM IT MAY CONGERN: l l

Be it known that I, THOMAS M. BRADLEY, of Chestnut Level, Lancaster county, State of Pennsylvania, have invented new and useful Improvements ip Sewing-Machines;'and I do hereby declare the following to be l an ,exact description thereof, reference being had to the accompanying drawings, and to the letters of re'ereneef;A marked thereon, making a part of this specification, in which- Figure 1 represents a side` elevation of the sewing-machine. Figure 2, a. front view. Figure 3, a perspective view of theshuttle-box; and Figure 4, the shuttle-box and shuttle. The nature 'of my invention consistsin the arrangement and combination of the upright` lever D with. its curved arm C, and the plate H with the needle-bar .l operated by the wheel A; `als`o the adjustable feed-bar M, and also the pivote'd shuttle-box a and its movable hammer W, operating on the inclined lever Z.

A, the ,circular wheel onthe main shaft, having pins B BV on each side, and at a distance apart of about an eighth of the circumference of the wheel, the one pin, B, operating on the curved armC o f the upright lever D until the needle E raises up and draws the loop of the thread over the point 4ot' the shuttle F, when the pin passes 'the point of the curved arm G, and the upper` spring G draws the lever D up again. The otherpin B (on the opposite side ofthe wheel A) operates ina curved or eccentric-slot of the plate H, that is attached to i the vertical needle-bar J, and moves the bar up anddown. The needle-bar J works in guides K K oi' the frame L, and on the front ofthe frame L is a. feeder-bnr, M, with a vertical slot at top, and a regulating set-scrcw, N, passing through a longitudinally-slotted guide, P, so as to give the bar a slight inclination to either side for the vpurpose oi' regulating the length ofthe stitch, which I style' a perfect loekstitch that will not of itself unravel, The lower part ofthe feeder-bar M has a vertical inclined slot` in which a projecting pin, Q (on: thc lower end of .therupright needle-bar) operates, and moves the feed-bar M the length of the stitch required. This pin Q also holds and fastens the needle to the needle-bar J. At the lower end of the feeder-bar M are two ratchetwhcels R R, operating in oncvdireetion, to move the cloth forward, and to prevent the cloth from working hack. The lower end of the lever D has an elbow, S, that prevents the lever from rising higher than the guide T.V Projecting downwards from tho elbow S is an @tension-cylinder, provided with a spiral spring on the inside t. for the purpose ot allowing t-lieheadV to yield as it falls down and strikes upon the'hea'd of spring-hammer W, that moves the deviccsoi' the movable shuttle F beneath. As the spring-hammer W strikes or presses upon a seat, Y, of an inclined spring-lever, Z, the point of the lever -Z is pressed against the side of a semicircular cylinder or shuttle-holder, a, (which ishsuspended on two pinsb and moves or throws the lower part of the shuttle-holder a-i'orward, for the purpose of `moving the lower and pointed er1-:lof the shuttle F forward, until the loop ofthe thread has passed over the point of the shuttle F, the point of the shuttle having passed between the thread and the needle while the needle was stationary, and just before moving upwards. The needle-thread passes up and around the top of the shuttle, is interlocked with the shuttle-thread, andis drawn up against the lower side of the cloth, forming a secure lock-stitch. The shuttle F has a curved point, as shown, is round at the top, and has a bohbin in the inside. There 'are two springs, c c, on the outside of the shuttlo-holder a, for the purpose of keeping thc shuttle F to its proper place as the thread passe-s over the point, and also thelist `side of'the shuttle against the face-plate d ot the box or case e, in which the shuttle-holder a operates. The needle passes down and up in a groove in the side ofthe face-plate along the side of the shuttle F. The spool fis regulated b'y a spirallspring and set-srerew at top. g is alwire spring, to regulate the tension of the thread; h, the. frame to support the devices. I i i `What claim as'umyinvention, and desire to secure by Letters Patent, is-

1. -The arrangement and combination of the upright lover D with its'curved arm C, the nlate H, the needlebar J, and the wheel A, as herein described, and for the purposes set forth. Y i

2. I also claim the movable hammer W, inclined lever Z, and pivoted shuttle-box a, as combined and operated by the upright lever D, as herein described, and for the purposes set forth. l i T. M. BRADLEY.-

Witnesses: Y

J. FRANKLIN IturcAnr, EDM. F. BROWN. 

